/*
 * Copyright (C) 2017. Uber Technologies
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.uber.rib.core;

import com.uber.autodispose.ScopeProvider;
import com.uber.rib.core.lifecycle.WorkerEvent;

import io.reactivex.CompletableSource;
import io.reactivex.Maybe;
import io.reactivex.Observable;

/** {@link ScopeProvider} for {@link Worker} instances. */
public class WorkerScopeProvider implements ScopeProvider {

  private final Observable<WorkerEvent> workerLifecycleObservable;

  WorkerScopeProvider(Observable<WorkerEvent> workerLifecycleObservable) {
    this.workerLifecycleObservable = workerLifecycleObservable;
  }

  @Override
  public CompletableSource requestScope() {
    return workerLifecycleObservable.skip(1).firstElement().ignoreElement();
  }
}
